That includes the disappearance and appearance of wildlife species. That’s what scientists discovered when they inventoried mammals and amphibians on Charity Island, a 252-acre speck near the mouth of Saginaw Bay in Lake Huron. It’s one of about 35,000 islands in the Great Lakes, most of them even smaller than Charity Island, according to a recent study. Charity Island is within the Shiawassee National Wildlife Refuge, and the U.S. For a baseline on biodiversity there, scientists led by Giorgia Auteri, a senior research scientist at Bat Conservation International, used the findings of the University of Michigan’s Mershon Expedition which surveyed Charity Island’s wildlife in 1910.